Now measure orange juice in milliliters (there are 1,000 milliliters in a liter). Write formulas for total cost and marginal cost when orange juice is measured in milliliters. Convert your marginal cost formula from dollars per milliliter to dollars per liter. Are you now more confident of your answer to Exercise? What do you think will happen if you measure orange juice in even smaller units?

In the following exercises suppose that x liters of orange juice can be produced for a total cost of $x2.